GST Add Calculator
Add GST to a taxable amount and preview CGST/SGST halves.
Presets are shortcuts only. Type any custom rate that applies to the supply.
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gst
Input Parameters
Calculation Result
Calculated Result
1,180.00
GST of 18% added to 1,000.00.
Summary Breakdown
Taxable amount
1,000.00GST
180.00CGST (half)
90.00SGST (half)
90.00Price with GST
1,180.00Confirm the rate, place of supply, exemptions and current law before filing or invoicing.
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Calculation Formula & Methodology
Inclusive = exclusive × (1 + rate/100).
All arithmetic is processed locally in your browser session using IEEE 754 precision with boundary checks.
Worked example
Scenario: 1,000 at 18%.
Calculated Outcome: GST 180, inclusive 1,180.
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Frequently Asked Questions
When should I use the GST Add Calculator?
Add GST to a taxable amount and preview CGST/SGST halves. Always read the formula and assumptions on the page before relying on a figure.
Are the results official?
No. OmniCalc runs the math in your browser from the inputs you provide. Laws, lender policies and medical guidance are not applied automatically.
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